Suppose that the reaction time (sec) to a certain stimulus is a continuous random variable with a density function given by f(x)= k/x for 1<=x<=10 and 0 otherwise.
a) Sketch a graph of f(x)
b) Find numerical value of k
c) What is the probability that x exceeds 3?
d) What is the probability that x lies within .25 sec of 3?